聯合國環境署在2022年發布的年度「排放差距報告(Emissions Gap Report)」指出:「要能走上將全球增溫限制在1.5°C之路,全球的年度溫室氣體排放量必須把8年前訂立的政策中預定達成的排放量再降低45%,而且要在2030年後仍繼續快速下降,以免把有限的剩餘大氣碳預算耗盡。[7]:xvi這份報告還評論說,世界應該關注「涵蓋廣泛的整體經濟轉型」,而非專注於逐步增量式變化。[7]:xvi
所謂節能是使用更少的能源服務而達到減少能源消耗(英語:Consumption of energy)的目的。為達到目的,可透過更有效的使用(使用更少的能源而達到相同的結果)或減少使用服務數量(例如減少駕車)來實現。節能位於可持續性能源階層(英語:energy hierachy)結構的頂端。 [96]可通過減少浪費和損失、技術升級以提高效率,以及改進運作和維護來達到節能的目的。
應對氣候變化的個人行動包括許多個人選擇,例如飲食、旅行、家庭能源耗用、商品和服務的消費以及家庭規模。希望減少碳足跡的人(尤其是在高收入經濟體內,又過著高消費生活方式的人)可採取「具有重大影響」行動,例如避免成為飛行常客、避免使用以汽油作燃料的汽車、攝取主要為植物性飲食、少生子女、[100][101]延長衣服和電子產品的使用時間,[102]以及使用電力烹飪及取暖。[103][104]但對於收入較低的人來說,做出這些改變會更加困難,因為他們通常無法負擔電動汽車等的成本。過度消費對於氣候變化的影響(英語:Effects of climate change)遠大於人口增長。[105]過度消費生活方式對環境的影響甚為巨大,全球富人中排名在前10%的,其生活方式的排放量即約佔全球總排放量的一半。[106][107]
植樹造林(Afforestation)是在以前沒有樹木覆蓋的地方種植樹木。依據氣候變化情景估計,建立佔地達4,000百萬公頃(Mha,即6,300 x 6,300公里)的新種植園,到2100年的碳儲存能力會超過900吉噸(等於2,300吉噸二氧化碳)。[132]但這類設想並不被認為是可行的積極減排替代方案,[133]因為所需種植園面積過於龐大,會把大多數自然生態系統排除,或是減少糧食生產。[134]植樹造林的其中一例是種兆棵樹運動(英語:Trillion Tree Campaign)。[135][136]
建築物區塊佔全球能源相關二氧化碳排放量的23%。[18]:141大約有一半的能源用於空間調溫和把水加熱。[195]建築物中的隔熱設施可顯著降低一次能源的需求。熱泵是種智能式設備,可參與需量反應,有利於變動式(或稱間歇式)可再生資源整合到電網中。[196]太陽能熱水器直接利用太陽熱能。人們自助的做法包括在家庭需求改變時搬到較小的住處、混合使用空間和共同使用設備。[90]:71在建新建物時可使用被動式太陽能建築設計(英語:passive solar building design)、低耗能建築(英語:low-energy building)或零碳建築新技術。此外,在城市的開發,利用顏色更淺、反光性更強的材料,以建造出更節能的建築。
IPCC. Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al , 編. Climate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press. 2022: 300 [2023-06-24]. (原始內容存檔於2022-08-02).: The global benefits of pathways limiting warming to 2°C (>67%) outweigh global mitigation costs over the 21st century, if aggregated economic impacts of climate change are at the moderate to high end of the assessed range, and a weight consistent with economic theory is given to economic impacts over the long term. This holds true even without accounting for benefits in other sustainable development dimensions or nonmarket damages from climate change (medium confidence).
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Franziska Funke; Linus Mattauch; Inge van den Bijgaart; H. Charles J. Godfray; Cameron Hepburn; David Klenert; Marco Springmann; Nicolas Treich. Toward Optimal Meat Pricing: Is It Time to Tax Meat Consumption?. Review of Environmental Economics and Policy. 2022-07-19, 16 (2): 000. S2CID 250721559. doi:10.1086/721078(英語). animal-based agriculture and feed crop production account for approximately 83 percent of agricultural land globally and are responsible for approximately 67 percent of deforestation (Poore and Nemecek 2018). This makes livestock farming the single largest driver of greenhouse gas (GHG) emissions, nutrient pollution, and ecosystem loss in the agricultural sector. A failure to mitigate GHG emissions from the food system, especially animal-based agriculture, could prevent the world from meeting the climate objective of limiting global warming to 1.5°C, as set forth in the Paris Climate Agreement, and complicate the path to limiting climate change to well below 2°C of warming (Clark et al. 2020).
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Herib, Blanco; André, Faaij. A review at the role of storage in energy systems with a focus on Power to Gas and long-term storage. Renewable and Sustainable Energy Reviews. 2018, 81: 1049–1086. ISSN 1364-0321. doi:10.1016/j.rser.2017.07.062.
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